ALLIANT ENERGY CORP

For the period ended Mar 31, 2026. Filed May 1, 2026.

About this filing

A company's report for each of its first three quarters. The financial statements are not audited. It shows how the business has moved since the last annual report, and what management says changed.

Mar 31, 2026 · Filed May 1, 2026

LNT$73.46+1.1%Stored close · as of Nov 9, 2026

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Contents

Definitions

The following abbreviations or acronyms used in this report are defined below:

Abbreviation or Acronym	Definition	Abbreviation or Acronym	Definition
2025 Form 10-K	Combined Annual Report on Form 10-K filed by Alliant Energy, IPL and WPL for the year ended Dec. 31, 2025	IPL	Interstate Power and Light Company
AEF	Alliant Energy Finance, LLC	IUC	Iowa Utilities Commission
Alliant Energy	Alliant Energy Corporation	MDA	Management’s Discussion and Analysis of Financial Condition and Results of Operations
ATC	American Transmission Company LLC	MISO	Midcontinent Independent System Operator, Inc.
ATC Holdings	Interest in American Transmission Company LLC and ATC Holdco LLC	MW	Megawatt
Corporate Services	Alliant Energy Corporate Services, Inc.	MWh	Megawatt-hour
Dth	Dekatherm	N/A	Not applicable
EPA	U.S. Environmental Protection Agency	Note(s)	Combined Notes to Condensed Consolidated Financial Statements
EPS	Earnings per weighted average common share	PSCW	Public Service Commission of Wisconsin
Financial Statements	Condensed Consolidated Financial Statements	SEC	Securities and Exchange Commission
FTR	Financial transmission right	U.S.	United States of America
GAAP	U.S. generally accepted accounting principles	WPL	Wisconsin Power and Light Company

ContentsView on SEC.gov

The text of this filing, as the company filed it with the SEC, without its images or exhibits. This is not investment advice.